diff --git a/src/chart/helper/whiskerBoxCommon.ts b/src/chart/helper/whiskerBoxCommon.ts
index 9502d3b6f8..efd425afa4 100644
--- a/src/chart/helper/whiskerBoxCommon.ts
+++ b/src/chart/helper/whiskerBoxCommon.ts
@@ -57,10 +57,7 @@ class WhiskerBoxCommonMixin<Opts extends CommonOption> {
      */
     _hasEncodeRule(key: string) {
         const encodeRules = this.getEncode();
-        if (encodeRules && encodeRules.data && encodeRules.data.has(key)) {
-            return encodeRules.data.get(key) != null;
-        }
-        return false;
+        return encodeRules && encodeRules.get(key) != null;
     }
 
     /**